我正在使用 PHP 来布局导航菜单并根据 URL 显示内容。

我已经到达 IF-ELSE 堆栈，它确定要显示的内容(通过加载必要的类和/或方法)。但是必须有更好的方式来写这个……有什么建议吗？

BreadCrumbs::getCrumb() 是一个静态方法，用于根据索引值(URI Request，以'/'分隔，然后保存在数组中)检索从 URL 中保存的元素。

...(ArrayHelp::recValueSearch(BreadCrumbs::getCrumb(2), Config::getNavPrimary()) 根据包含来自 Config 类的导航列表的数组检查 URI 元素。

BreadCrumbs::setEmptyCrumb(1, "home") 运行一个方法，如果值不存在或无效(在导航列表数组中)则设置默认值

<?php
// set bread crumbs
BreadCrumbs::setCrumbs($_SERVER['REQUEST_URI']);
BreadCrumbs::setEmptyCrumb(1, "home");
BreadCrumbs::setEmptyCrumb(2, "all");



if (BreadCrumbs::getCrumb(1) == 'about') {
    echo 'This is the <b>About</b> Page';
}
else if (BreadCrumbs::getCrumb(1) == 'contact') {
    echo 'This is the <b>Contact</b> Page';
}
else if (BreadCrumbs::getCrumb(1) == 'search') {
    echo 'This is the <b>Search</b> Page';
}
else if (BreadCrumbs::getCrumb(1) == 'home') {
    if (BreadCrumbs::getCrumb(2) == 'all') {
        echo 'This is the <b>Home</b> Page';
    }
    else if (ArrayHelp::recValueSearch(BreadCrumbs::getCrumb(2), Config::getNavSecondary())) {
        echo 'This is the list page for category: <b>' . BreadCrumbs::getCrumb(1) . '</b> and the country filter is: <b>'. BreadCrumbs::getCrumb(2) . '</b>';
    }
    else {
        echo 'change filter value and go to the <b>home</b> page';
    }
}
else if (ArrayHelp::recValueSearch(BreadCrumbs::getCrumb(1), Config::getNavPrimary())) {
    if (BreadCrumbs::getCrumb(2) == 'all') {
        echo 'This is the list page for category: <b>' . BreadCrumbs::getCrumb(1) . '</b> and the country filter is <b>all countries</b>';
    }
    else if (ArrayHelp::recValueSearch(BreadCrumbs::getCrumb(2), Config::getNavSecondary())) {
        echo 'This is the list page for category: <b>' . BreadCrumbs::getCrumb(1) . '</b> and the country filter is: <b>'. BreadCrumbs::getCrumb(2) . '</b>';
    }
    else {
        echo 'change filter value to all and go to category: <b>' . BreadCrumbs::getCrumb(1) . '</b>';
    }
}
else {
    echo 'redirect page to home/all';
}

?>

编辑:改成下面的 Switch 语句，好一点..

    <?php
    $array_helper = new ArrayHelp;
    $valid_primary = $array_helper->recValueReturn(BreadCrumbs::getCrumb(1), Config::getNavPrimary());
    $valid_secondary = $array_helper->recValueReturn(BreadCrumbs::getCrumb(2), Config::getNavSecondary());
    switch (BreadCrumbs::getCrumb(1)) {
        case 'about' :
        case 'contact' :
        case 'search' :
            echo 'This is the <b>' . BreadCrumbs::getCrumb(1) . '</b> Page';
            break;
        case 'home' :
            switch (BreadCrumbs::getCrumb(2)) {
                case 'all' :
                    echo 'This is the <b>Home</b> Page';
                    break;
                case ($valid_secondary[1]) : 
                    echo 'This is the list page for category: <b>' . BreadCrumbs::getCrumb(1) . '</b> and the country filter is: <b>'. BreadCrumbs::getCrumb(2) . '</b>';
                    break;
                default:
                    echo 'change filter value and go to the <b>' . BreadCrumbs::getCrumb(1) . '</b> page';
                    break;
            }
            break;
        case ($valid_primary[1]) :
            switch (BreadCrumbs::getCrumb(2)) {
                case ($valid_secondary[1]) : 
                    echo 'This is the list page for category: <b>' . BreadCrumbs::getCrumb(1) . '</b> and the country filter is: <b>'. BreadCrumbs::getCrumb(2) . '</b>';
                    break;
                default:
                    echo 'change filter value and go to the <b>' . BreadCrumbs::getCrumb(1) . '</b> page';
                    break;
            }
            break;
        default:
            echo 'redirect page to home/all';
            break;
    }
?>